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jonny [76]
3 years ago
15

Factor this expression completely. x2 - r2

Mathematics
1 answer:
OverLord2011 [107]3 years ago
3 0
This can be factored as a difference of two squares. When you have a difference of two squares (a² - b²), it will factor out into (a + b) (a - b).

(x² - r²)
(x + r)(x - r)

You can multiply the two groups to double check it.

(x + r)(x - r)
x² - rx + rx - r²
x² - r²
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